摘要
测试了缅甸各种颜色的翡翠的紫外-可见-近红外光谱,结果表明,不同颜色的翡翠的光谱具有不同的特征,反映出致色原因的差异,但437nm吸收峰可见于各种颜色的翡翠中。光谱特征分析表明,硬玉中的Fe主要以Fe3+离子的形式类质同象替代Al3+,Fe3+离子与Cr3+离子的作用不同,它对硬玉矿物的颜色没有实质性的影响;Cr3+离子是绿色翡翠的致色剂;Mn3+离子可以更好地解释紫色翡翠的各种与颜色成因有关的光谱特征。漂白注胶处理的和染色的翡翠具有与未处理翡翠不同的紫外-可见-近红外光谱特征。
UVVISNIR spectra of jadeite jades with different colours from Burma have been tested. The results show that the spectra of jadeite jades with different colours have different characteristics, reflecting the difference of colouration, and the absorption peak of 437 nm occurs in the various jadeite jades. The results show that (1) the absorption of 437 nm peak caused by Fe3+ ion is most common and can be seen in jadeite jades with various colours, but it is the most weak in the green and the deep green jadeite jades; (2) the role of Fe3+ ion is different from that of Cr3+ ion, it has no substantive influence on the colour of jadeite jade; (3) the experiment has not found the evidence of Fe2+ existing in the jadeite jade from Burma; (4) Cr3+ ion is the colouring agent of green jadeite jade; (5)the hypothesis of Mn3+ ion as the colouring agent can explain various characteristics of UVVISNIR spectrum; (6) UVVISNIR spectra of jadeite jades treated by bleaching and plastic impregnation and dyeing are different from that of the untreated, and can be regarded as diagnostic features.
出处
《宝石和宝石学杂志》
CAS
2003年第4期11-16,共6页
Journal of Gems & Gemmology
